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Ventilation of manholes.

Ventilation of manholes.

Ventilation of manholes.

Published Year

• 1930-1939 (2)
• 1940-1949 (1)

Subject

• Manholes (3) *
• Mine ventilation (2)
• Air (1)
• Manholes--Design and construction (1)
• Manholes--Maintenance and repair (1)

Author

• Jones, G. W. (3) *
• Miller, W. E. (3) *
• Campbell, John. (2)
• Yant, W. P. (2)
• Campbell, John, (1)

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